Summary information and primary citation
- PDB-id
- 8enk; SNAP-derived features in text and JSON formats;
DNAproDB
- Class
- RNA binding protein-RNA
- Method
- X-ray (2.5 Å)
- Summary
- Crystal structure of uap56 in complex with tho1, the yeast homolog of human sarnp
- Reference
- Xie Y, Gao S, Zhang K, Bhat P, Clarke BP, Batten K, Mei M, Gazzara M, Shay JW, Lynch KW, Angelos AE, Hill PS, Ivey AL, Fontoura B, Ren Y (2023): "Structural basis for high-order complex of SARNP and DDX39B to facilitate mRNP assembly." Cell Rep, 42, 112988. doi: 10.1016/j.celrep.2023.112988.
- Abstract
- mRNA in eukaryotic cells is packaged into highly compacted ribonucleoprotein particles (mRNPs) in the nucleus and exported to the cytoplasm for translation. mRNP packaging and export require the evolutionarily conserved transcription-export (TREX) complex. TREX facilitates loading of various RNA-binding proteins on mRNA through the action of its DDX39B subunit. SARNP (Tho1 [transcriptional defect of Hpr1 by overexpression 1] in yeast) is shown to interact with DDX39B and affect mRNA export. The molecular mechanism of how SARNP recognizes DDX39B and functions in mRNP assembly is unclear. Here, we determine the crystal structure of a Tho1/DDX39B/RNA complex, revealing a multivalent interaction mediated by tandem DDX39B interacting motifs in SARNP/Tho1. The high-order complex of SARNP and DDX39B is evolutionarily conserved, and human SARNP can engage with five DDX39B molecules. RNA sequencing (RNA-seq) from SARNP knockdown cells shows the most affected RNAs in export are GC rich. Our work suggests the role of the high-order SARNP/DDX39B/RNA complex in mRNP assembly and export.
